29.The following SASprogram is sumbitted:

  data WORK.INFO;

     infile 'DATAFILE.TXT';

     input @1 Company $20. @25 State $2. @;

     if State=' ' then input @30 Year;

     else input @30 City Year;

     input NumEmployees;

  run;

How many raw datarecords are read during each iteration of the DATA step?

     A. 1

     B. 2

     C. 3

     D. 4

Answer: A

为什么是1呢？if语句后面没有加@，那input NumEmployees这一句不就应该是读入下一行吗？